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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Weighted average price of options that were either forfeited or expired.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Equity - Stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Stock options, Number of Options
Outstanding at the beginning of the period (in shares)			2,079
Granted (in shares)			247	215
Exercised (in shares)			(129)
Cancelled (in shares)			(56)
Outstanding at the end of the period (in shares)	2,141		2,141		2,079
Exercisable at the end of the period (in shares)	1,696		1,696
Stock options, Weighted Average Exercise Price per Share
Outstanding at the beginning of the period (in dollars per share)			$ 80.25
Granted (in dollars per share)			91.85
Exercised (in dollars per share)			34.09
Cancelled (in dollars per share)			113.73
Outstanding at the end of the period (in dollars per share)	$ 83.49		83.49		$ 80.25
Exercisable at the end of the period (in dollars per share)	$ 76.92		$ 76.92
Additional information pertaining to stock options
Average Remaining Contractual Term, Outstanding			5 years 5 months 15 days		5 years 6 months 3 days
Average Remaining Contractual Term, Exercisable			4 years 7 months 17 days
Aggregate Intrinsic Value, Outstanding (in dollars)	$ 22		$ 22		$ 42
Aggregate Intrinsic Value, Exercisable (in dollars)	22		22
Cash received from exercise of stock options			$ 4
Weighted average grant date fair value of stock options granted (per share)			$ 14.02	$ 24.01
Total intrinsic value of stock options exercised	1	$ 1	$ 7	$ 12
Stock options
Share-based compensation
Term of award			10 years
Period of vesting			3 years
Required service period			1 year
Assumptions used to measure the fair value of awards
Expected life			5 years 6 months	5 years 6 months
Risk-free interest rate (as a percent)			2.50%	2.50%
Expected volatility (as a percent)			19.70%	19.80%
Expected dividend yield (as a percent)			2.70%	1.80%
Additional information pertaining to stock options
Unrecognized compensation cost	$ 3		$ 3
Weighted-average period for amortization of unrecognized compensation cost			1 year 6 months